Analysis of the Inflow of Water from Tongguan-Sanmenxia Reach of Sanmenxia Reservoir During Autumn Flood Season in 2021
In 2021,the Yellow River experienced the most serious autumn flood since 1949.The Sanmenxia Reservoir played an important role in the autumn flood control,but there was 1.04 billion cubic meters difference between the inflow and outflow of the flood volume.In order to identify the cause of the above water imbalance,this paper took Tongguan-Sanmenxia reach as the study area,and digital elevation model,land use,soil type,meteorological and hydrological data were used to drive a HEC-HMS distributed hydrological model for flood processes simulation.The results show that the bias of simulated flood peak in 11 floods are all less than 20.0%,the average coefficient of determination of the simulations is 0.725,and the pass rate of the results is 90.9%.The model accurately simulates the water inflow process in the Tongguan-Sanmenxia reach during the au-tumn flood season in 2021,and the contribution of different tributaries to the total flood amount of the reach is quantified.
HEC-HMS modelflood compositionSanmenxia Reservoirwatershed of Tongguan-Sanmenxia reach
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